Tigerkit is born to Tawnypelt and Rowanclaw, along with his brother Flamekit and his sister Dawnkit in ShadowClan. He is apprenticed to Oakfur; however, during his apprenticeship, ShadowClan is taken over by Sol and loses faith in StarClan, forcing Tawnypelt take her kits to ThunderClan, where Tigerpaw is apprenticed to Brackenfur. He also meets his uncle, the ThunderClan deputy, Brambleclaw. He, his siblings, Lionblaze, Hollyleaf, and Jaypaw create a fake sign to make Blackstar believe in StarClan again, which is successful, allowing Tigerpaw to return to ShadowClan soon afterwards.
"That doesn't mean I have to be like him. [Tigerstar] almost destroyed ShadowClan once before. I wasn't going to let him do it again!"
—Tigerheart to Thistleclaw during the Great Battle The Last Hope, page 292
He becomes a warrior with the name Tigerheart and is chosen by Blackstar to go with Toadfoot to investigate the cause of the drought along with six other warriors from the other Clans. During this time, he forms a relationship with the ThunderClan apprentice Dovepaw, and she falls for him. After returning to the Clans, he sneaks out of camp at night to meet Dovepaw and is eventually revealed to be training in the Place of No Stars under the guidance of Brokenstar and Tigerstar, his grandfather. Tigerheart forms an uneasy relationship with Ivypaw, Dovepaw's sister, who is also training in the Dark Forest. His brother, Flametail, drowns in the lake, and Tigerheart stands with Dawnpelt as she believes Jayfeather drowned their littermate. Eventually, the Dark Forest attacks the Clans, and Tigerheart chooses to side with his Clan. Dovewing says their relationship cannot continue due to them being of different Clans, and Tigerheart sadly accepts this.
"Tigerstar only cares about what's best for Tigerstar. [...] He abandoned his Clan and kin when they needed him. Then he came back when it suited him. And his mate is no better. Dovewing broke the warrior code and had kits with a warrior from another Clan, and then left her own Clan to be with him and took her kits with her. [...] A leader is supposed to set an example for their Clan. What kind of example has Tigerstar set?"
—Sandynose to Frecklewish, Mintfur, and Violetshine about Tigerstar The Raging Storm, page 27
His father becomes the leader of ShadowClan, and Tigerheart trains an apprentice, Sleekpaw. Upon the death of Crowfrost to yellowcough, Tigerheart is appointed deputy in his place, although he, Tawnypelt, and Rowanstar leave for ThunderClan when Darktail takes over ShadowClan. He plays a pivotal role in driving out the the Kin, though when ShadowClan is reinstated, he leaves to be with Dovewing, who he had reconciled with and is expecting his kits. His departure causes Rowanstar to disband ShadowClan to join SkyClan.
Tigerheart returns to the Clans and reforms ShadowClan as its new leader. During his time away, Dovewing gave birth to their kits, Lightkit, Pouncekit, and Shadowkit, and he also brings Blaze, Ant, and Cinnamon, three Twolegplace cats, to become warriors, as well as several missing ShadowClan cats. Tigerstar takes on an aggressive stance against the other Clans in an effort to make ShadowClan strong and respected again, causing the a conflict. He dismisses claims about his deputy, Juniperclaw, poisoning SkyClan's prey, and after Juniperclaw's death, he appoints Cloverfoot as his new deputy.
"The time has come to attack! Getting rid of that mangy interloper is worth the risk. We can never be sure we're strong enough, but this is the right thing to do, even if we may not win! We are warriors! Are we afraid of a cat who doesn't even have his own body?"
During a harsh leaf-bare, Shadowpaw receives terrible visions about codebreakers and is troubled when his mother is accused of being one. Tigerstar reveals to his son that Dovewing did break the code to be with him, but insists Dovewing's true place is in ShadowClan. He grows angry when the other Clans refuse to allow ShadowClan to take part in freeing the Moonpool because of Shadowpaw and often confides with Puddleshine, Cloverfoot, and Tawnypelt. His son also receives a vision about the Clans fighting with Tigerstar and Bramblestar viciously attacking each other.
He is proud of his son when he receives his full name and becomes annoyed and angry when Bramblestar demands Tigerstar punish his codebreakers. Tigerstar refuses to conform to Bramblestar's bullying and later learns from Squirrelflight that Bramblestar is an impostor and is shown the true Bramblestar's ghost from Rootpaw. Convinced, Tigerstar rallies ShadowClan against the impostor and gives Squirrelflight a place in ShadowClan. After more and more cats are exiled, Tigerstar finds an ally in Leafstar and helps her and Squirrelflight spearhead the resistance. During a battle instigated by the impostor, Tigerstar publicly exposes him and fights him one-on-one, nearly killing him before having him imprisoned in ShadowClan.
"Spire had another vision. He heard a voice. A voice Spire said was for me. It gave him a message about Rowanstar. The voice said he needs me. It said he can't keep the shadows together. I can't ignore this sign. Rowanstar can't keep the Clan together. I have to go back. Please don't think I don't love you. You and the kits are the most important things in my life. But if I abandon my Clan now, when they need me, I will never forgive myself."
In Tigerheart's Shadow, after ShadowClan is restored after the Kin's rule, Tigerheart feels torn between supporting Rowanstar and trying to lead his Clanmates, as they had only seemed to take orders from him. The reveal of Dovewing's plight to give birth to their kits away from the Clans and Puddleshine’s terrible visions forces Tigerheart to leave ShadowClan. He finds Dovewing with the guardian cats in a Twolegplace where she gives birth to Shadowkit, Pouncekit, and Lightkit. Tigerheart works with Fierce and takes on a more leadership role during his experience away from ShadowClan.
Tigerheart realizes that Puddleshine's visions were fore sighting him as the true leader of ShadowClan and decides to take his family back to the Clans. Some of the guardian cats, Spire, Blaze, Ant, and Cinnamon, join him. On their way back, Tigerheart discovers Rippletail, Berryheart, Cloverfoot, and Sparrowtail hiding in a Twoleg nest, and he convinces them to return to ShadowClan with his patrol. Along the way, Tigerheart is killed by an owl after saving Hollowkit by suffering critical internal injuries, and he joins StarClan. However, Rowanclaw, now dead, informs his son that he is still needed in the living world, and after the patrol carries Tigerheart's body to the Moonpool, Tigerheart is resurrected with eight lives to reinstate ShadowClan, becoming Tigerstar. After being revived, Tigerstar is reunited with his family and Clanmates and leads them home.
"It's just like ThunderClan to defend the enemies of ShadowClan."
In Squirrelflight's Hope, Tigerstar's attitude is making it uneasy for Bramblestar to try and keep relations peaceful between the Clans, and Tigerstar aims to expand his territory so his cats have enough to eat. When Stonewing and Strikestone are attacked by the Sisters, and Strikestone permanently maimed by them, Tigerstar grows livid and demands that the group be driven out in retaliation, as well as the territory they occupy would be beneficial for SkyClan. He helps lead the Clans in the battle against the Sisters, but when he realizes there are kits, he attempts to call off the attack, to no avail. When the Sisters leave, Tigerstar is content with the rearranged borders.
This section summarizes Tigerstar's significant Super Editions appearances. If you're looking for a full list, find one here!
In Tawnypelt's Clan, Tigerstar appoints Tawnypelt as his deputy. She struggles to adjust to the new ShadowClan under Tigerstar's leadership. When Shadowkit has violent seizures accompanied by terrible visions of Tribe of Rushing Water's destruction, Tawnypelt firmly believes Shadowkit is meant to go there. However, Tigerstar refuses, and Tawnypelt accuses him of not listening to any cat and acting like the original Tigerstar. While in the mountains, Rowanclaw appears to Tawnypelt in a dream and urges her to let Tigerstar find his footing as leader. After they return to the Clans, Tawnypelt steps down as Tigerstar's deputy, believing her son will need a younger deputy if ShadowClan is to survive the changes.
With this life I give you strength. Don't let softness sway you from what must be done for your Clan.
With this life I give you courage. Fear will always pull at your tail, but the courage I give you now will always draw you on.
With this life I give you compassion. Love your Clan as you love your kits. Forgive them their flaws and love them even when they fail you.
With this life I give you hope. As long as hope burns in your heart. It will burn in the hearts of your Clanmates.
I am Yellowfang, once of ShadowClan. With this life, I give you forgiveness. Forgiveness will give you more power than vengeance will ever bring.
I am Sagewhisker. With this life, I give you persistence. Don't let failure sap your determination or rejection change your mind. A true leader tries as many times as it takes to succeed.
Tigerheart. Fear of failure has kept you too long from leadership. But leadership is your destiny, and one that you must embrace if you are to save your Clan. So with this life I give you acceptance. Accept with all your heart what you cannot change, and fear will vanish.
I, Raggedstar, give you this life for loyalty. A leader's loyalty belongs only to his Clan. Let loyalty be your heartbeat, for when it stops, so will you.
I wish I could still walk at your side. I wish I could help you reunite our Clan. With this life I give you love. You have known so much, but still have much to give. Leadership without love will never be enough to draw your Clan from the shadows. Let your heart lead when your head does not know the way.
This has never been done before. You have already used up one life, but there are eight remaining. Use them as your used the first—with courage and for the good of others.
There must always be five Clans. Where there is sky, thunder, wind, and river, there must also be shadow.
You are the only one who can bring ShadowClan back.